How to Write Functions in JavaScript?
Anonymous functions are functions without a name, often used as callbacks or immediately invoked. Arrow functions are a concise way to write anonymous functions:
const add = (x, y) => x + y;
console.log(add(5, 7)); // Outputs: 12
Understanding scope is crucial when working with functions. Variables declared within a function are only accessible within that function (local scope). However, nested functions can access variables from their containing functions (closure):
function outer() {
const message = "Hello from outer!";
function inner() {
console.log(message);
}
return inner;
}
const innerFunction = outer();
innerFunction(); // Outputs: Hello from outer!
Troubleshooting and Best Practices: Navigating Common Challenges
While mastering functions is exhilarating, it’s important to be prepared for challenges that may arise:
- Debugging Functions
